Added a new option (-n) to enable timestamp normalization within a sa…

…me sweep

host/hackrf-tools/src/hackrf_sweep.c

@@ -184,6 +184,7 @@ uint32_t amp_enable;
 bool antenna = false;
 uint32_t antenna_enable;
 
+bool timestamp_normalized = false;
 bool binary_output = false;
 bool ifft_output = false;
 bool one_shot = false;
@@ -231,8 +232,8 @@ int rx_callback(hackrf_transfer* transfer)
 		return 0;
 	}
 
-	// happens only once
-	if (usb_transfer_time.tv_sec == 0 && usb_transfer_time.tv_usec == 0) {
+	// happens only once with timestamp_normalized == true
+	if ((usb_transfer_time.tv_sec == 0 && usb_transfer_time.tv_usec == 0) || timestamp_normalized == false) {
 		// set the timestamp for the first sweep
 		gettimeofday(&usb_transfer_time, NULL);
 	}
@@ -273,9 +274,12 @@ int rx_callback(hackrf_transfer* transfer)
 				}
 				sweep_count++;
 
-				// set the timestamp of the next sweep
-				memset(&usb_transfer_time, 0, sizeof (usb_transfer_time));
-				gettimeofday(&usb_transfer_time, NULL);
+				if (timestamp_normalized == true)
+				{
+					// set the timestamp of the next sweep
+					memset(&usb_transfer_time, 0, sizeof (usb_transfer_time));
+					gettimeofday(&usb_transfer_time, NULL);
+				}
 
 				if (one_shot) {
 					do_exit = true;
@@ -397,6 +401,7 @@ static void usage()
 		"\t[-N num_sweeps] # Number of sweeps to perform\n"
 		"\t[-B] # binary output\n"
 		"\t[-I] # binary inverse FFT output\n"
+                "\t[-n] # keep the same timestamp within a sweep\n"
 		"\t-r filename # output file\n"
 		"\n"
 		"Output fields:\n"
@@ -438,7 +443,7 @@ int main(int argc, char** argv)
 	uint32_t freq_max = 6000;
 	uint32_t requested_fft_bin_width;
 
-	while ((opt = getopt(argc, argv, "a:f:p:l:g:d:n:N:w:1BIr:h?")) != EOF) {
+	while ((opt = getopt(argc, argv, "a:f:p:l:g:d:N:w:n1BIr:h?")) != EOF) {
 		result = HACKRF_SUCCESS;
 		switch (opt) {
 		case 'd':
@@ -500,6 +505,10 @@ int main(int argc, char** argv)
 			fftSize = DEFAULT_SAMPLE_RATE_HZ / requested_fft_bin_width;
 			break;
 
+		case 'n':
+			timestamp_normalized = true;
+			break;
+
 		case '1':
 			one_shot = true;
 			break;